CECO ENVIRONMENTAL CORP

Ticker: CECO CUSIP: 125141101 Class: Common Stock

Walleye Trading LLC's Holding History (CIK: 0001388391)

Note: Option positions (PUT/CALL) are excluded.

Q4 2017

Shares 34,100 Value ($000) $175 Avg Close $6.73 Range $4.68 - $9.41

Q4 2016

Shares 5,600 Value ($000) $78 Avg Close $11.85 Range $9.25 - $14.45

Q4 2015

Shares 3,900 Value ($000) $30 Avg Close $7.95 Range $6.51 - $10.43

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2017	34,100	$175	$6.73	$4.68 - $9.41
Q4 2016	5,600	$78	$11.85	$9.25 - $14.45
Q4 2015	3,900	$30	$7.95	$6.51 - $10.43